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Rotor Cranks RS4 road double system, 175mm, new 2004 model, $495.00
Steel spindle, integrated bottom bracket, 39/53T black chainrings and bolts, English BSA thread, brand new in box
Note: We ship Fedex ground for this item, you can specify an upgrade to 2nd day or overnight at checkout. Because we have distributors in most countries (see rotorbike.com for a list), and for security purposes, we can only sell to and ship within the U.S.
Payments accepted via PayPal with a verified address, or by money order within 7 days of auction closing.
Rotor Cranks work by increasing the force required on the drive side crankarm which propels the non-drive crank are past the 12 o'clock point ... also known as the dead spot. This happens 180 times a minute in a 90RPM ride. Or 10,800 times an hour. The cyclist is now "permanently pushing" the cranks as there is no gap between when the legs take over push/recover duties, otherwise known as the dead spot. This elimination of the dead spot allows the rider to produce more wattage and lower his/her lactate threshold. The extra wattage is converted to speed in the amount of 2-3 minutes per 40k.
Rotor is an innovative pedalling system that eliminates the dead point. The dead point of conventional pedalling is the void that occurs when the pedals are vertically positioned (one at the top and the other at the bottom), which is a moment at which neither leg can transmit any power.
The dead point limits the cyclist's performance, causes tendonitis and injuries to the knee, as well as discontinuity in the traction. Rotor System provides the definitive solution to this inefficiency, which is typical of conventional pedalling, by definitively eliminating dead points.
Rotor makes the cranks independent in such a way that they are not aligned at a fixed 180º, but rather the angle between them varies during the cycle in such a way that one pedal never coincides with the one below, thus avoiding power vacuums. Such an effect is achieved by the use of independent cranks that are synchronised by means of an exocentric axel and two rods, which vary the development during the cycle and adapt to the muscle power of the legs at all times. By eliminating the dead point, Rotor optimises the effort of the cyclist and reduces the risk of injury, providing a notable increase in performance and more comfortable and healthy pedalling.
Scientifically proven to reduce lacate levels by 13% and lower the heart rate by 3-4%, allowing you to ride harder before reaching lactate threshold, by an average of 2 minutes faster over 40k, or 8-10 minutes in an Ironman.
"The tests were completed in two consecutive days, realizing each day half of the racers with one system and the other half with the other system. The cyclists were monitored with a Polar Pulse Monitor, and in different moments of the test (32, 40, 48, 54 y 62 Km/h) blood samples were obtained via the ear lobe to measure lactic acids (YSI model 1500 Sport). The results obtained show that at the same speed, the heart rate (3.5%) as well as the lactic acid (13.5% at the end of the test) were lower when the Rotor system was used, with greatest differences at levels where the force applied was nearest to the anaerobic threshold of the cyclist. In conclusion, we believe that the Rotor system is a mechanism that improves the metabolic efficiency of the cyclist and produces less physical wear for the same amount of work."
Read the full tests conducted by renound physiologists Dr. Martinez and Dr. Cordova.
The Benefits provided by Rotor System By eliminating the dead point, the Rotor system maximises performance, as shown by scientific studies carried out by prestigious international universities. The results demonstrate that Rotor achieves a real increase in power of up to 16% (equivalent to an average advantage of 3 minutes in an hour), as well as a reduction in lactic acid and cardiac effort.
a) Reduction of lactates: Rotor reduces the concentration of lactates in the blood thanks to greater muscular efficiency, thus reducing fatigue.
b) Reduction of cardiac effort: Consequently, as a result of the reduction of lactates in the blood, cardiovascular demand is less.
c) Reduces knees injuries: Conventional pedalling subjects the knee to great articulatory stress when the leg is pushing on the upper dead point. By eliminating the dead point, Rotor reduces the typical knee injuries of the cyclist, due to less stress on the knee tendon. Thanks to the variation of the development during the cycle, the push is more progressive and the articulatory stress is more uniform.
Rotor can be fitted to all the frames and accessories commercialised on the market, and is available in road (double and triple discs) and mountain bike versions. Rotor can be adapted to all user's profile and use, whether leisure or competition, thanks to an exclusive regulation points system.
The Rotor Crank system offers improvements in a cyclist's efficiency and power development, and is simple enough to be retrofitted to almost any bicycle. The Rotor system optimizes the angular rate of each crank independently in addition to providing variable effective chainring size. Varying the angular rate of the legs may sound a little odd at first, but it actually makes a lot of sense. Just as the swimmer's arm is slower when it is in the water, pulling against the load, and faster when it is recovering through the air for the next Power Phase, the Rotor System enables the cyclist to spend more time in the Power Phase. By virtue of its mechanical linkage, the Rotor System allows the cyclists to spend more time generating power during one revolution. The variance in angular rate is subtle to the rider, however, making the Rotor Crank System easy to adapt to.
You might think that spending more time in the power stroke is going to make the cyclist more tired. Actually, the opposite is the case. The kinematics of the Rotor system enable the cyclist to develop more power for a given level of effort by increasing the effective chainring size for the pedal down-stroke (power phase) while decreasing the effective chainring size for the pedal up-stroke.
The graph below shows that the power generated by a cyclist with a conventional crank system is not consistent around the entire pedal stroke (blue curve). A conventional crank arm is a fixed length, making the power generated by the cyclists directly proportional to the power generated by the leg for an entire revolution. The figure also shows a computational analysis of the benefits of the Rotor system (red curve) with a rider expending the same amount of effort as the blue curve. You can see that the Rotor system provides increased power for the majority of the revolution.
The Rotor System offers two significant improvements over the conventional crank technology. Each of the improvements help draw more power from a cyclist's legs.
The Rotor mechanical linkage creates an effective increase in the chainring size for the pedal down-stroke (power phase) while decreasing the effective chainring size for the pedal up-stroke to minimize torque loss. The variation for a 34 tooth chainring is shown in the following diagram:
The Rotor system also varies the angular rate of the crank to provide more time in the power stroke and less time in the up-stroke. This is accomplished by allowing the cranks to move relative to each other. As one crank finshes its power stroke, the other leg has already bugun a power stroke.
This eliminates the dead spot that occurs when the cranks are vertical, with one leg at the end and one at the beginning of the down-stroke.
The benefits of the Rotor System have been evaluated in the laboratory by Dr. Cordova of the University of Valladolid, Castilla-Leon. In his research, Dr. Cordova performed back-to-back comparisons of the Rotor system and conventional cranks. He found that for a given effort level, the Rotor system increased power up to 16%. He also found that for a given power output, the Rotor system reduced lacate production by 15% and heart rate by 5%, indicating improved efficiency. He concluded that the Rotor system is a real advantage.
The mechanical linkage of the Rotor system does weigh as much as 460 grams more than competing crank/bottom-bracket sets depending on the level of the crank. But, if Dr. Cordova's findings are even half right, the added weight of the Rotor system is easily offset by the net increase in power and efficiency provided to the rider.
Rotor Components is cooperating with other known Universities and scientists, and is encouraging further in depth testing and comparisons of the Rotor system cranks to traditional cranks and other inventions claiming to provide benefit to the cyclist.
What using Rotor Cranks will do for you - guaranteed:
Road Racing - removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, greatly improves climbing ability and power.
Time Trial - allows for increased wattage production without an increase in fatigue, removes the dead point from your stroke, lowers your lactate levels and heart rate, improves climbing ability and power for rolling TT courses.
Triathlon - removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves running split due to less fatigued legs.
Mountain Bike - greatly improves rear wheel traction, removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves climbing ability and power.
Cyclo-Cross - improves rear wheel traction, removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves climbing ability and power, helps with running due to less fatigued legs.
Recumbent - removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves climbing ability and power.
This is a closeout item. The 30-day guarantee period does not apply. All sales final, however the 2 year warranty does apply.
More information can be found at our online store: www.RotorCranksUSA.com
Thanks, Gary Tingley - Rotor Cranks USA
next
Rotor Cranks RS4 road double system, 175mm, new 2004 model, $495.00
Steel spindle, integrated bottom bracket, 39/53T black chainrings and bolts, English BSA thread, brand new in box
Note: We ship Fedex ground for this item, you can specify an upgrade to 2nd day or overnight at checkout. Because we have distributors in most countries (see rotorbike.com for a list), and for security purposes, we can only sell to and ship within the U.S.
Payments accepted via PayPal with a verified address, or by money order within 7 days of auction closing.
Rotor Cranks work by increasing the force required on the drive side crankarm which propels the non-drive crank are past the 12 o'clock point ... also known as the dead spot. This happens 180 times a minute in a 90RPM ride. Or 10,800 times an hour. The cyclist is now "permanently pushing" the cranks as there is no gap between when the legs take over push/recover duties, otherwise known as the dead spot. This elimination of the dead spot allows the rider to produce more wattage and lower his/her lactate threshold. The extra wattage is converted to speed in the amount of 2-3 minutes per 40k. Rotor is an innovative pedalling system that eliminates the dead point. The dead point of conventional pedalling is the void that occurs when the pedals are vertically positioned (one at the top and the other at the bottom), which is a moment at which neither leg can transmit any power.
The dead point limits the cyclist's performance, causes tendonitis and injuries to the knee, as well as discontinuity in the traction. Rotor System provides the definitive solution to this inefficiency, which is typical of conventional pedalling, by definitively eliminating dead points.
Rotor makes the cranks independent in such a way that they are not aligned at a fixed 180º, but rather the angle between them varies during the cycle in such a way that one pedal never coincides with the one below, thus avoiding power vacuums. Such an effect is achieved by the use of independent cranks that are synchronised by means of an exocentric axel and two rods, which vary the development during the cycle and adapt to the muscle power of the legs at all times. By eliminating the dead point, Rotor optimises the effort of the cyclist and reduces the risk of injury, providing a notable increase in performance and more comfortable and healthy pedalling.
Scientifically proven to reduce lacate levels by 13% and lower the heart rate by 3-4%, allowing you to ride harder before reaching lactate threshold, by an average of 2 minutes faster over 40k, or 8-10 minutes in an Ironman. "The tests were completed in two consecutive days, realizing each day half of the racers with one system and the other half with the other system. The cyclists were monitored with a Polar Pulse Monitor, and in different moments of the test (32, 40, 48, 54 y 62 Km/h) blood samples were obtained via the ear lobe to measure lactic acids (YSI model 1500 Sport). The results obtained show that at the same speed, the heart rate (3.5%) as well as the lactic acid (13.5% at the end of the test) were lower when the Rotor system was used, with greatest differences at levels where the force applied was nearest to the anaerobic threshold of the cyclist. In conclusion, we believe that the Rotor system is a mechanism that improves the metabolic efficiency of the cyclist and produces less physical wear for the same amount of work."
Read the full tests conducted by renound physiologists Dr. Martinez and Dr. Cordova.
The Benefits provided by Rotor System By eliminating the dead point, the Rotor system maximises performance, as shown by scientific studies carried out by prestigious international universities. The results demonstrate that Rotor achieves a real increase in power of up to 16% (equivalent to an average advantage of 3 minutes in an hour), as well as a reduction in lactic acid and cardiac effort.
a) Reduction of lactates: Rotor reduces the concentration of lactates in the blood thanks to greater muscular efficiency, thus reducing fatigue.
b) Reduction of cardiac effort: Consequently, as a result of the reduction of lactates in the blood, cardiovascular demand is less.
c) Reduces knees injuries: Conventional pedalling subjects the knee to great articulatory stress when the leg is pushing on the upper dead point. By eliminating the dead point, Rotor reduces the typical knee injuries of the cyclist, due to less stress on the knee tendon. Thanks to the variation of the development during the cycle, the push is more progressive and the articulatory stress is more uniform.
Rotor can be fitted to all the frames and accessories commercialised on the market, and is available in road (double and triple discs) and mountain bike versions. Rotor can be adapted to all user's profile and use, whether leisure or competition, thanks to an exclusive regulation points system.
The Rotor Crank system offers improvements in a cyclist's efficiency and power development, and is simple enough to be retrofitted to almost any bicycle. The Rotor system optimizes the angular rate of each crank independently in addition to providing variable effective chainring size. Varying the angular rate of the legs may sound a little odd at first, but it actually makes a lot of sense. Just as the swimmer's arm is slower when it is in the water, pulling against the load, and faster when it is recovering through the air for the next Power Phase, the Rotor System enables the cyclist to spend more time in the Power Phase. By virtue of its mechanical linkage, the Rotor System allows the cyclists to spend more time generating power during one revolution. The variance in angular rate is subtle to the rider, however, making the Rotor Crank System easy to adapt to.
You might think that spending more time in the power stroke is going to make the cyclist more tired. Actually, the opposite is the case. The kinematics of the Rotor system enable the cyclist to develop more power for a given level of effort by increasing the effective chainring size for the pedal down-stroke (power phase) while decreasing the effective chainring size for the pedal up-stroke.
The graph below shows that the power generated by a cyclist with a conventional crank system is not consistent around the entire pedal stroke (blue curve). A conventional crank arm is a fixed length, making the power generated by the cyclists directly proportional to the power generated by the leg for an entire revolution. The figure also shows a computational analysis of the benefits of the Rotor system (red curve) with a rider expending the same amount of effort as the blue curve. You can see that the Rotor system provides increased power for the majority of the revolution.
The Rotor System offers two significant improvements over the conventional crank technology. Each of the improvements help draw more power from a cyclist's legs.
The Rotor mechanical linkage creates an effective increase in the chainring size for the pedal down-stroke (power phase) while decreasing the effective chainring size for the pedal up-stroke to minimize torque loss. The variation for a 34 tooth chainring is shown in the following diagram:
The Rotor system also varies the angular rate of the crank to provide more time in the power stroke and less time in the up-stroke. This is accomplished by allowing the cranks to move relative to each other. As one crank finshes its power stroke, the other leg has already bugun a power stroke.
This eliminates the dead spot that occurs when the cranks are vertical, with one leg at the end and one at the beginning of the down-stroke.
The benefits of the Rotor System have been evaluated in the laboratory by Dr. Cordova of the University of Valladolid, Castilla-Leon. In his research, Dr. Cordova performed back-to-back comparisons of the Rotor system and conventional cranks. He found that for a given effort level, the Rotor system increased power up to 16%. He also found that for a given power output, the Rotor system reduced lacate production by 15% and heart rate by 5%, indicating improved efficiency. He concluded that the Rotor system is a real advantage.
The mechanical linkage of the Rotor system does weigh as much as 460 grams more than competing crank/bottom-bracket sets depending on the level of the crank. But, if Dr. Cordova's findings are even half right, the added weight of the Rotor system is easily offset by the net increase in power and efficiency provided to the rider.
Rotor Components is cooperating with other known Universities and scientists, and is encouraging further in depth testing and comparisons of the Rotor system cranks to traditional cranks and other inventions claiming to provide benefit to the cyclist.
What using Rotor Cranks will do for you - guaranteed:
Road Racing - removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, greatly improves climbing ability and power.
Time Trial - allows for increased wattage production without an increase in fatigue, removes the dead point from your stroke, lowers your lactate levels and heart rate, improves climbing ability and power for rolling TT courses.
Triathlon - removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves running split due to less fatigued legs.
Mountain Bike - greatly improves rear wheel traction, removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves climbing ability and power.
Cyclo-Cross - improves rear wheel traction, removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves climbing ability and power, helps with running due to less fatigued legs.
Recumbent - removes the dead point from your stroke, lowers your lactate levels and heart rate, increases endurance, improves climbing ability and power.
This is a closeout item. The 30-day guarantee period does not apply. All sales final, however the 2 year warranty does apply.
More information can be found at our online store: www.RotorCranksUSA.com
Thanks, Gary Tingley - Rotor Cranks USA
next